Human arms, dogs' front legs, birds' wings, and whales' front fins do not serve the exact same function, but they are built upon the same set of homologous bones, indicating a common ancestry. The similarities in the bone structure of these limbs suggest that they evolved from a common ancestor, even though they have adapted to different functions in different species.
- Human Arms:
- Used for a wide range of functions, including grasping, manipulating objects, and locomotion.
- Dogs' Front Legs:
- Primarily used for support, locomotion, and manipulating objects to a lesser extent.
- Birds' Wings:
- Evolved for flight and are used for propulsion, steering, and maintaining balance during flight.
- Whales' Front Fins:
- Adapted for swimming and steering in water, providing lift and stability.
While these limbs have different functions, they share a common underlying structure, which is an example of homology in evolution.